[gnome-calendar] manager: implement GcalManager::query_client_data

[Erick Pérez Castellanos <erickpc src gnome org>]

commit c48edbd68262856141f72ff7c3b1f1365df08a7b
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Feb 10 13:14:11 2015 -0200

    manager: implement GcalManager::query_client_data

 src/gcal-manager.c |   28 ++++++++++++++++++++++++++++
 src/gcal-manager.h |    4 ++++
 2 files changed, 32 insertions(+), 0 deletions(-)
---
diff --git a/src/gcal-manager.c b/src/gcal-manager.c
index e44e5b5..63920ca 100644
--- a/src/gcal-manager.c
+++ b/src/gcal-manager.c
@@ -1089,6 +1089,34 @@ gcal_manager_set_query (GcalManager *manager,
 }
 
 /**
+ * gcal_manager_query_client_data:
+ *
+ * Queries for a specific data field of
+ * the { link ECalClient}.
+ *
+ * Returns: (Transfer none) a string representing the retrieved value, or NULL.
+ */
+gchar*
+gcal_manager_query_client_data (GcalManager *manager,
+                                ESource     *source,
+                                const gchar *field)
+{
+  GcalManagerPrivate *priv;
+  GcalManagerUnit *unit;
+  gchar *out;
+
+  priv = gcal_manager_get_instance_private (manager);
+  unit = g_hash_table_lookup (priv->clients, source);
+
+  if (unit == NULL)
+    return NULL;
+
+  g_object_get (unit->client, field, &out, NULL);
+
+  return out;
+}
+
+/**
  * gcal_manager_add_source:
  * @manager: a #GcalManager
  * @base_uri: URI defining the ESourceGroup the client will belongs
diff --git a/src/gcal-manager.h b/src/gcal-manager.h
index 6b1bf77..e12d01b 100644
--- a/src/gcal-manager.h
+++ b/src/gcal-manager.h
@@ -105,6 +105,10 @@ void           gcal_manager_set_search_subscriber   (GcalManager        *manager
 void           gcal_manager_set_query               (GcalManager        *manager,
                                                      const gchar        *query);
 
+gchar*         gcal_manager_query_client_data       (GcalManager        *manager,
+                                                     ESource            *source,
+                                                     const gchar        *field);
+
 gchar*         gcal_manager_add_source              (GcalManager        *manager,
                                                      const gchar        *name,
                                                      const gchar        *backend,